The tractor hydraulic system
(57) Abstract:Usage: in General engineering and is intended for use on tractors agricultural and industrial purposes. The inventive hydraulic system includes a pump 1, reported by the suction hydroline 2 tank 3 and the actuator 4 (e.g., hydraulic cylinder). In addition, the hydraulic system has a valve 5, is in communication with the tank 3 drain hydroline 6 through the orifice 7 of viscous resistance. Drain hydroline 6 additionally communicated with a suction hydroline 2 through the spring loaded check valve 8. 1 Il. The invention relates to mechanical engineering and is intended for use on agricultural and industrial tractors.A known hydraulic system (ed. St. USSR N 511888, class A 01 B 63/10, 1974), containing the pump, soobshenii suction hydroline with the tank and the pressure (pressure) hydroline with the valve, and orifice made in the form of a combination of chokes viscous and inertial resistance, and drain hydroline the valve is constantly communicated with the hydraulic tank through the throttle viscous resistance (viscous choke), and in the elevated viscosity of the fluid (in the case of low ambient temperature and in the starting period) the viscous resistance of the throttle much more than the inertial resistance of the inductor. As a result, most part of the merging flow of the working fluid supplied by the hydraulic tank directly into the suction hydroline pump that improves absorption and contributes to the rapid heating of fluid in the working circuit of the hydraulic system.At a high temperature working fluid, the viscous resistance of the inductor is much less than the inertial resistance of the inductor. Therefore, the main part of the merging flow of the working fluid supplied to the cooling tank.This hydraulic system provides satisfactory conditions of the absorption liquid pump in the starting period. The disadvantage of the hydraulic system is the fact that at high temperatures the working fluid part of it passing through the inertial throttle, almost not involved in the heat exchange, thereby reducing the cooling capacity of gidroprovod.The technical result, which must be made in the invention is the improvement of thermal regime of the hydraulic system by ensuring the full circulation of the working fluid flow through the tank at high temperatures.The technical result is achieved in that the drain hidrolik retina illustrated in the drawing, which shows the diagram of the hydraulic system.The tractor hydraulic system includes a pump 1, which suction hydroline 2 communicated with the tank 3. The pump 1 is communicated with the hydraulic motor (hydraulic cylinder) 4 through the control valve 5. For draining the working fluid from the hydraulic cylinder 4 or from the pump 1 serves as a drain hydroline 6. Drain hydroline 6 communicated with the tank 3 through the orifice 7 and with a suction hydroline 2 through the spring loaded check valve 8. A throttle valve located in a common housing. The orifice 7 is formed of parallel channels is characterized by a relatively long length and small traversable cross section. This embodiment of the inductor (choke viscous resistance or linear) provides the change of pressure loss (hydraulic resistance) is proportional to the viscosity of the liquid.The described hydraulic system operates as follows.When the high viscosity of the working fluid of the hydraulic resistance of the inductor 7 is large, the pressure at its inlet check valve 8 is fully open and the main part of the flow merging fluid comes from the hydroline 6 in the suction hydroline 2 pump 1.With the increase in the scale 7 decreases, the consequence is an increase in the share of the working fluid traveling through the orifice 7 in the tank 3 for cooling.In the case that the working fluid temperatures close to the upper limit, the pressure at the inlet of the throttle 7 becomes less than the opening pressure spring-loaded check valve 8 closes and the entire flow of the working fluid is directed into the tank 3, ensuring maximum cooling capacity of the hydraulic system. The tractor hydraulic system containing a pump, indicated by the suction hydroline with the tank, and connected with the hydraulic pump and the valve, is in communication with the hydraulic tank drain hydroline through the throttle viscous resistance, while the drain hydroline communicated with a suction hydroline through gidromashorion, characterized in that the flow meter is a spring-loaded check valve communicated with the drain hydroline-side shut-off element.
FIELD: agricultural engineering.
SUBSTANCE: recuperative hydraulic drive has hydraulic cylinder for suspension mechanism, drain hydraulic main and pressure hydraulic main, hydraulic accumulator, hydraulic distributor, pump, hydraulic tank, hydraulic cylinder of safety mechanism for working tools of tillage apparatus, hydraulic shock-absorbers for drive part, and spring-loaded pressure multiplier. Hydraulic cylinder for safety mechanism is connected through one back valve and adjustable throttle to pressure hydraulic main communicating with hydraulic accumulator and through other back valve to drain hydraulic main. Stem cavities of hydraulic accumulators are connected through one pair of back valves and cavities outside stems through throttle to pressure main and other pair of back valves to drain hydraulic main. Cavity of spring-loaded pressure multiplier is communicating at side adjoining larger-diameter piston with cavity outside stem of hydraulic cylinder of suspension mechanism, and cavity of spring-loaded pressure multiplier is communicating at side adjoining smaller-diameter piston through one back valve with pressure hydraulic main and through other back valve with drain hydraulic main.
EFFECT: reduced consumption of power and enhanced reliability in operation of tillage apparatus.
FIELD: agricultural engineering.
SUBSTANCE: wheel support 15, 30 is designed for agricultural machine 1 furnished with at least one feeding device 5 for mounting of agricultural operating tool. At least one supporting wheel 15 is positioned on supporting frame 30 connected to agricultural harvesting machine 1, 2 and feeding device 4, 5. Feeding device 4, 5 rests upon machine 1 through hydraulic cylinders 9 with stems 8. Said at least one supporting wheel 15 is made controllable.
EFFECT: increased strength of construction, improved wheel support and good maneuverability of agricultural machine.
21 cl, 4 dwg
SUBSTANCE: method involves establishing carrier wheels of tillage tool at predetermined tillage depth; regulating position of upper and lower tie-rods of front tractor hitch relative to soil surface; after penetration of working devices into soil, positioning tillage tool frame and lower tie-rods in parallel with soil surface; positioning upper tie-rod is parallel with direction of action of soil draft upon working devices of tillage tool; controlling parallel position of upper tie-rod by zero value of mathematical expectancy of vertical acceleration measured in center of gravity of tillage tool; for cultivation, directing upper tie-rod end connected to tillage tool upward, for disking, directing this end downward relative to soil surface. Apparatus has front tractor hitch with upper and lower tie-rods and tillage tool frame with tine. Upper tie-rod is formed as hydraulic cylinder and double-armed lever. Hydraulic cylinder is pivotally connected to tine of tillage tool frame through stem and pivotally connected to one end of double-armed lever through body. Double-armed lever is pivotally mounted on pin of upper tie-rod of hitch and pivotally connected with its other end to tractor frame through hydraulic cylinder. Vertical acceleration sensor is positioned in center of gravity of tillage tool frame. Frame tine angular movement sensor is positioned on lower tie-rod. Acceleration and angular movement sensors are connected to inputs of control unit. Hydraulic distributor for hitch is connected to outputs of control unit.
EFFECT: improved quality of soil tillage process and reduced consumption of power for soil tillage process.
2 cl, 4 dwg
FIELD: agriculture and mining industry, in particular, loading equipment for farm tractors.
SUBSTANCE: loader is designed for farm tractors furnished with standard hydraulically controlled, parallel lifting levers 1, 2 pivotally mounted on tractor rear part and equipped with central connection device 3 in tractor between two lifting levers. Loader has two parallel levers 5, 6 for connection to respective levers 1, 2 so as to extend rearward, generally in longitudinal direction of axes of lifting levers 1, 2. Central tie-rod 7, which may be hydraulically extended during operation, protrudes to the outside from central connection device 3, in parallel with lifting levers. Levers 5, 6 and outer end of central tie-rod 7 are adapted for connection to working tool or device 12.
EFFECT: increased efficiency owing to enabling fast mounting of working equipment onto tractor, and reduced production costs.
8 cl, 6 dwg
SUBSTANCE: hydraulic drive comprises hydraulic cylinder of the mounted device, drain and pressure supply lines, hydraulic cylinder of safety mechanism of tiller operation elements, hydraulic shock absorbers of running gear and spring-loaded pressure intensifier, hydraulic accumulator, hydraulic valve, pump and hydraulic reservoir. The hydraulic drive comprises also automatic overload relief valve connected with the pressure supply line by a return valve, the above supply line is connected to the hydraulic accumulator as well as to the hydraulic reservoir through the on/off control valve and safety valve.
EFFECT: reducing fuel consumption and increasing reliability of forestry assembly.
SUBSTANCE: invention refers to forestry engineering. The system consists of a pump coupled with hydraulic distributor by means of pressure and auxiliary pipelines; the hydraulic distributor is connected with a working cavity of a power hydraulic ram via a pilot-operated check valve with a back spring-loaded valve. A throttle-safety valve is additionally installed in the pilot operated check valve on the side of the pressure line. The valve consists of a case having inlet and outlet cavities divided between them with a partition with through openings and a central opening. A spring-loaded throttling disk valve is installed in the central opening; it facilitates flow of working agent to the power hydraulic ram via an axial opening of the inlet cavity made in shape identical to the shape of the disk valve; also working agent flows through a T-joint with a pressure gauge connected to the case of the throttle-safety valve on the side of the outlet cavity.
EFFECT: ensuring fast control of working elements feeding.
SUBSTANCE: machine comprises traction transport device and monaxonic machine connected to its by means of connecting rod hingedly attached to facility. Wheel tractor or crawler tractor is used as traction transport device. Monaxonic machine is connected to tractor with the help of connecting rod, front part of which is fixed to tractor frame at the bottom, near base middle, with the help of hinged joint having three degrees of rotary motion.
EFFECT: improved efficiency of building block approach, simplified control of soil treatment depth.
10 cl, 5 dwg
FIELD: machine building.
SUBSTANCE: invention refers to hydraulic systems of feeding operating facility users. Feeding system consists of four-way continuously adjusted valve (8); two users (15, 17) are fed with working medium under pressure via this valve. Straight and back pipelines (18, 20) are installed between four-way valve (8) and users (15, 17). Distributing valve mechanism (26, 28, 27, 29) is installed in the said pipelines. Four-way valve (8) is arranged on a tractor, while distributing valve mechanism (26, 28, 27, 29) is mounted on a working facility. Volume consumption of working medium is regulated on the tractor, while distribution of working medium is performed on the working facility by means of the distributing valve mechanism.
EFFECT: increased number of hydraulic users and increased efficiency of facility.
9 cl, 2 dwg